/Engine/Source/Developer/DesktopPlatform/Public/IDesktopPlatform.h
Gets the root directory for the engine's saved config files
The absoluate path to the engines Saved/Config directory
[FString](API\Runtime\Core\Containers\FString) GetEngineSavedConfigDirectory ( const [FString](API\Runtime\Core\Containers\FString) & Identifier )